I wish to migrate my Drupal 7 book content type nodes to Drupal 9 book, along with the book hierarchies. I've only found one document which talks about book module migration, but it is for Drupal 5 - 7.
Can someone point me to some documentation which explains this process?
Fixed
9.4
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
@SomebodySysop just want to thank you for outlining your process. As far as I can tell, your comment is the only place on the web actually documenting this in any form whatsoever.
This article may also be a help: https://www.morpht.com/blog/data-migration-book-module.